// Copyright 2023 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.

#include "pw_allocator/allocator.h"

#include <algorithm>
#include <cstring>

#include "pw_assert/check.h"
#include "pw_bytes/alignment.h"

namespace pw::allocator {

void* Allocator::DoReallocate(void* ptr, Layout layout, size_t new_size) {
  if (new_size == 0) {
    return nullptr;
  }
  if (Resize(ptr, layout, new_size)) {
    return ptr;
  }
  void* new_ptr = DoAllocate(Layout(new_size, layout.alignment()));
  if (new_ptr == nullptr) {
    return nullptr;
  }
  if (ptr != nullptr && layout.size() != 0) {
    std::memcpy(new_ptr, ptr, layout.size());
    DoDeallocate(ptr, layout);
  }
  return new_ptr;
}

}  // namespace pw::allocator
